/*******************************************************************************
 * Copyright 2011-2014 Sergey Tarasevich
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.nostra13.universalimageloader.core.download;

import android.annotation.TargetApi;
import android.content.ComponentName;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.graphics.Bitmap;
import android.graphics.Bitmap.CompressFormat;
import android.graphics.drawable.AdaptiveIconDrawable;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.media.ThumbnailUtils;
import android.net.Uri;
import android.os.Build;
import android.provider.ContactsContract;
import android.provider.MediaStore;
import android.webkit.MimeTypeMap;

import com.nostra13.universalimageloader.Data;
import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.assist.ContentLengthInputStream;
import com.nostra13.universalimageloader.utils.IoUtils;

import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;

import sarsamurmu.adaptiveicon.AdaptiveIcon;

/**
 * Provides retrieving of {@link InputStream} of image by URI from network or file system or app resources.<br />
 * {@link URLConnection} is used to retrieve image stream from network.
 *
 * @author Sergey Tarasevich (nostra13[at]gmail[dot]com)
 * @since 1.8.0
 */
public class BaseImageDownloader implements ImageDownloader {
    /**
     * {@value}
     */
    public static final int DEFAULT_HTTP_CONNECT_TIMEOUT = 5 * 1000; // milliseconds
    /**
     * {@value}
     */
    public static final int DEFAULT_HTTP_READ_TIMEOUT = 20 * 1000; // milliseconds

    /**
     * {@value}
     */
    protected static final int BUFFER_SIZE = 32 * 1024; // 32 Kb
    /**
     * {@value}
     */
    protected static final String ALLOWED_URI_CHARS = "@#&=*+-_.,:!?()/~'%";

    protected static final int MAX_REDIRECT_COUNT = 5;

    protected static final String CONTENT_CONTACTS_URI_PREFIX = "content://com.android.contacts/";

    private static final String ERROR_UNSUPPORTED_SCHEME = "UIL doesn't support scheme(protocol) by default [%s]. " + "You should implement this support yourself (BaseImageDownloader.getStreamFromOtherSource(...))";

    protected final Context context;
    protected final int connectTimeout;
    protected final int readTimeout;

    public BaseImageDownloader(Context context) {
        this(context, DEFAULT_HTTP_CONNECT_TIMEOUT, DEFAULT_HTTP_READ_TIMEOUT);
    }

    public BaseImageDownloader(Context context, int connectTimeout, int readTimeout) {
        this.context = context.getApplicationContext();
        this.connectTimeout = connectTimeout;
        this.readTimeout = readTimeout;
    }

    @Override
    public InputStream getStream(String imageUri, Object extra) throws IOException {
        switch (Scheme.ofUri(imageUri)) {
            case HTTP:
            case HTTPS:
                return getStreamFromNetwork(imageUri, extra);
            case FILE:
                return getStreamFromFile(imageUri, extra);
            case CONTENT:
                return getStreamFromContent(imageUri, extra);
            case ASSETS:
                return getStreamFromAssets(imageUri, extra);
            case DRAWABLE:
                return getStreamFromDrawable(imageUri, extra);
            case PACKAGE:
                return getStreamFromPackage(imageUri, extra);
            case UNKNOWN:
            default:
                return getStreamFromOtherSource(imageUri, extra);
        }
    }

    /**
     * Retrieves {@link InputStream} of image by URI (image is located in the network).
     *
     * @param imageUri Image URI
     * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
     *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
     * @return {@link InputStream} of image
     * @throws IOException if some I/O error occurs during network request or if no InputStream could be created for
     *                     URL.
     */
    protected InputStream getStreamFromNetwork(String imageUri, Object extra) throws IOException {
        HttpURLConnection conn = createConnection(imageUri, extra);

        int redirectCount = 0;
        while (conn.getResponseCode() / 100 == 3 && redirectCount < MAX_REDIRECT_COUNT) {
            conn = createConnection(conn.getHeaderField("Location"), extra);
            redirectCount++;
        }

        InputStream imageStream;
        try {
            imageStream = conn.getInputStream();
        } catch (IOException e) {
            // Read all data to allow reuse connection (http://bit.ly/1ad35PY)
            IoUtils.readAndCloseStream(conn.getErrorStream());
            throw e;
        }
        if (!shouldBeProcessed(conn)) {
            IoUtils.closeSilently(imageStream);
            throw new IOException("Image request failed with response code " + conn.getResponseCode());
        }

        return new ContentLengthInputStream(new BufferedInputStream(imageStream, BUFFER_SIZE), conn.getContentLength());
    }

    /**
     * @param conn Opened request connection (response code is available)
     * @return <b>true</b> - if data from connection is correct and should be read and processed;
     * <b>false</b> - if response contains irrelevant data and shouldn't be processed
     * @throws IOException
     */
    protected boolean shouldBeProcessed(HttpURLConnection conn) throws IOException {
        return conn.getResponseCode() == 200;
    }

    /**
     * Create {@linkplain HttpURLConnection HTTP connection} for incoming URL
     *
     * @param url   URL to connect to
     * @param extra Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
     *              DisplayImageOptions.extraForDownloader(Object)}; can be null
     * @return {@linkplain HttpURLConnection Connection} for incoming URL. Connection isn't established so it still configurable.
     * @throws IOException if some I/O error occurs during network request or if no InputStream could be created for
     *                     URL.
     */
    protected HttpURLConnection createConnection(String url, Object extra) throws IOException {
        String encodedUrl = Uri.encode(url, ALLOWED_URI_CHARS);
        HttpURLConnection conn = (HttpURLConnection) new URL(encodedUrl).openConnection();
        conn.setConnectTimeout(connectTimeout);
        conn.setReadTimeout(readTimeout);
        return conn;
    }

    /**
     * Retrieves {@link InputStream} of image by URI (image is located on the local file system or SD card).
     *
     * @param imageUri Image URI
     * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
     *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
     * @return {@link InputStream} of image
     * @throws IOException if some I/O error occurs reading from file system
     */
    protected InputStream getStreamFromFile(String imageUri, Object extra) throws IOException {
        String filePath = Scheme.FILE.crop(imageUri);
        if (isVideoFileUri(imageUri)) {
            return getVideoThumbnailStream(filePath);
        } else {
            BufferedInputStream imageStream = new BufferedInputStream(new FileInputStream(filePath), BUFFER_SIZE);
            return new ContentLengthInputStream(imageStream, (int) new File(filePath).length());
        }
    }

    private InputStream getVideoThumbnailStream(String filePath) {
        Bitmap bitmap = ThumbnailUtils.createVideoThumbnail(
                filePath, MediaStore.Images.Thumbnails.FULL_SCREEN_KIND);
        if (bitmap != null) {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            bitmap.compress(CompressFormat.PNG, 0, bos);
            return new ByteArrayInputStream(bos.toByteArray());
        }
        return null;
    }

    /**
     * Retrieves {@link InputStream} of image by URI (image is accessed using {@link ContentResolver}).
     *
     * @param imageUri Image URI
     * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
     *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
     * @return {@link InputStream} of image
     * @throws FileNotFoundException if the provided URI could not be opened
     */
    protected InputStream getStreamFromContent(String imageUri, Object extra) throws FileNotFoundException {
        ContentResolver res = context.getContentResolver();

        Uri uri = Uri.parse(imageUri);
        if (isVideoContentUri(uri)) { // video thumbnail
            Long origId = Long.valueOf(uri.getLastPathSegment());
            Bitmap bitmap = MediaStore.Video.Thumbnails
                    .getThumbnail(res, origId, MediaStore.Images.Thumbnails.MINI_KIND, null);
            if (bitmap != null) {
                ByteArrayOutputStream bos = new ByteArrayOutputStream();
                bitmap.compress(CompressFormat.PNG, 0, bos);
                return new ByteArrayInputStream(bos.toByteArray());
            }
        } else if (imageUri.startsWith(CONTENT_CONTACTS_URI_PREFIX)) { // contacts photo
            return getContactPhotoStream(uri);
        }

        return res.openInputStream(uri);
    }

    @TargetApi(Build.VERSION_CODES.ICE_CREAM_SANDWICH)
    protected InputStream getContactPhotoStream(Uri uri) {
        ContentResolver res = context.getContentResolver();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH) {
            return ContactsContract.Contacts.openContactPhotoInputStream(res, uri, true);
        } else {
            return ContactsContract.Contacts.openContactPhotoInputStream(res, uri);
        }
    }

    /**
     * Retrieves {@link InputStream} of image by URI (image is located in assets of application).
     *
     * @param imageUri Image URI
     * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
     *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
     * @return {@link InputStream} of image
     * @throws IOException if some I/O error occurs file reading
     */
    protected InputStream getStreamFromAssets(String imageUri, Object extra) throws IOException {
        String filePath = Scheme.ASSETS.crop(imageUri);
        return context.getAssets().open(filePath);
    }

    /**
     * Retrieves {@link InputStream} of image by URI (image is located in drawable resources of application).
     *
     * @param imageUri Image URI
     * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
     *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
     * @return {@link InputStream} of image
     */
    protected InputStream getStreamFromDrawable(String imageUri, Object extra) {
        String drawableIdString = Scheme.DRAWABLE.crop(imageUri);
        int drawableId = Integer.parseInt(drawableIdString);

        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            Drawable drawable = context.getResources().getDrawable(drawableId, context.getTheme());
            if (drawable instanceof AdaptiveIconDrawable) {
                Bitmap iconBitmap = new AdaptiveIcon()
                        .setDrawable((AdaptiveIconDrawable) drawable)
                        .setPath(Data.AdaptiveIconShape)
                        .setSize(272)
                        .render();

                ByteArrayOutputStream byteOutputStream = new ByteArrayOutputStream();
                iconBitmap.compress(CompressFormat.PNG, 0, byteOutputStream);
                byte[] bitmapData = byteOutputStream.toByteArray();
                ByteArrayInputStream byteInputStream = new ByteArrayInputStream(bitmapData);
                return byteInputStream;
            }
        }

        return context.getResources().openRawResource(drawableId);
    }

    /**
     * Retrieves {@link InputStream} of image by URI (image source from package name).
     *
     * @param imageUri Image URI
     * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
     *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
     * @return {@link InputStream} of image
     * @throws IOException if some I/O error occurs
     */
    protected InputStream getStreamFromPackage(String imageUri, Object extra) throws IOException {
        PackageManager packageManager = context.getPackageManager();
        String componentName = Scheme.PACKAGE.crop(imageUri);
        Bitmap resBitmap;

        int slashIndex = componentName.indexOf("/");
        String activityName = componentName.substring(slashIndex).replace("/", "");
        String packageName = componentName.replace("/" + activityName, "");

        Intent intent = new Intent();
        intent.setComponent(new ComponentName(packageName, activityName));
        ResolveInfo resolveInfo = packageManager.resolveActivity(intent, 0);
        Drawable drawable = resolveInfo.loadIcon(packageManager);
        resBitmap = getRightIcon(drawable);
        ByteArrayOutputStream stream = new ByteArrayOutputStream();
        resBitmap.compress(Bitmap.CompressFormat.PNG, 0, stream);
        resBitmap.recycle();
        return new ByteArrayInputStream(stream.toByteArray());
    }

    private static Bitmap getRightIcon(Drawable drawable) {
        if (android.os.Build.VERSION.SDK_INT < android.os.Build.VERSION_CODES.O) {
            return ((BitmapDrawable) drawable).getBitmap();
        } else {
            if (drawable instanceof BitmapDrawable) {
                return ((BitmapDrawable) drawable).getBitmap();
            } else if (drawable instanceof AdaptiveIconDrawable) {
                return new AdaptiveIcon()
                        .setDrawable((AdaptiveIconDrawable) drawable)
                        .setSize(272)
                        .render();
            }
        }
        return null;
    }

    /**
     * Retrieves {@link InputStream} of image by URI from other source with unsupported scheme. Should be overriden by
     * successors to implement image downloading from special sources.<br />
     * This method is called only if image URI has unsupported scheme. Throws {@link UnsupportedOperationException} by
     * default.
     *
     * @param imageUri Image URI
     * @param extra    Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
     *                 DisplayImageOptions.extraForDownloader(Object)}; can be null
     * @return {@link InputStream} of image
     * @throws IOException                   if some I/O error occurs
     * @throws UnsupportedOperationException if image URI has unsupported scheme(protocol)
     */
    protected InputStream getStreamFromOtherSource(String imageUri, Object extra) throws IOException {
        throw new UnsupportedOperationException(String.format(ERROR_UNSUPPORTED_SCHEME, imageUri));
    }

    private boolean isVideoContentUri(Uri uri) {
        String mimeType = context.getContentResolver().getType(uri);
        return mimeType != null && mimeType.startsWith("video/");
    }

    private boolean isVideoFileUri(String uri) {
        String extension = MimeTypeMap.getFileExtensionFromUrl(uri);
        String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
        return mimeType != null && mimeType.startsWith("video/");
    }
}
